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M98177GE <br />• allowed to accumulate in excavations during construction. Accumul- <br />ated water could negatively influence the site soil conditions. <br />Construction surface drainage should include swales, if necessary <br />to divert surface water away from the construction excavations. <br />Organic soil materials were encountered in the test borings. The <br />organic soil materials are not suitable for support of the struc- <br />ture or structural components. The organic soil materials should <br />be removed prior to foundation construction. <br />Man-placed fill material exists on <br />placed fill is not known and may not <br />structures or structural components. <br />man-placed fill should be verified~o <br />with compacted structural fill prior <br />structural components on the fill. <br />site. The quality of the man- <br />be suitable for support of the <br />The quality of the existing <br />r the fill removed and replaced <br />to supporting structures or <br />It has been our experience that sites in developed areas may con- <br />tain existing subterranean structures or poor quality man-placed <br />fill. If subterranean structures or poor quality man-placed fill <br />are suspected or encountered, they should be removed and replaced <br />with compacted structural fill as discussed under COMPACTED STRUC- <br />TURAL FILL below. <br />~5.0 <br />EXCAVATION CUT AND FILTH SLOPE STABILITY <br />We understand that excavation cut slopes and placed compacted <br />structural fill slopes will be constructed near the stacking tube <br />and stockpile area. <br />The stability of any slope is dependent on many factors. Typi- <br />cally the stability of a slope is analyzed by calculating the <br />anticipated gravitational forces that tend to drive the mass of <br />soil downhill and the anticipated internal strength of the soil <br />along the expected plane of failure that will resist the downhill <br />movements. if the driving forces are equal to or greater than the <br />resisting forces then failure is imminent. A theoretical calculat- <br />ed factor of safety of 1.5 is considered by the geotechnical <br />engineering industry as a minimum factor of safety for a slope to <br />be considered as stable. A calculated factor of safety of 1.0 or <br />less indicates that slope movement is imminent or in process. <br />Failure can occur as slow deformation, creep, or as a somewhat <br />spontaneous failure. <br />6 <br />Lambert anD ~.ssoriates <br />LOrvSU~nrvG GEOTEGrvNicAl EN GIK EENS •ND <br />y~TENq~ TESTING <br />